Have You Really Mastered the Correct Usage of the High Viscosity Rotary Pump Capable of Transporting Viscous Materials of Millions of Centipoise?

When selecting conveying equipment for many industrial scenarios, people first think of centrifugal pumps with simple structures. However, when handling materials featuring high viscosity, easy solidification or hygiene requirements, their efficiency drops sharply and they even fail to pump materials. At this moment, the adaptation advantages of high viscosity rotary pumps become prominent.

-Bonve Pump Industry Cam-type Bi-rotor Pump-

 The core structure of this type of equipment is as follows: inside the closed pump chamber, the driven outer rotor with internal teeth drives the inner rotor to rotate in the same direction. Together with the crescent plate structure between the pump body and front cover, it completely separates the suction port and discharge port. During operation, stable negative pressure forms on the suction port side to suck in materials. The continuous rotation of rotors carries materials to the discharge port side for pressurized extrusion, completing continuous conveying in the whole process. Its rotating speed maintains a stable linear correlation with flow rate, and the actual conveying capacity can be flexibly adjusted by changing the rotating speed. It covers a viscosity range from dozens of centipoise to millions of centipoise, with an applicable temperature range of -30℃ to +240℃. The normal operating rotating speed falls within the range of 200rpm to 600rpm, delivering high output pressure. It is suitable for quantitative conveying in long-distance pipelines with high resistance. The conveying process will not damage the original properties of materials or trigger changes in the physical and chemical characteristics of materials.

The wetted parts of equipment adopt obviously different materials under different working conditions; wrong material selection will directly shorten service life: ordinary cast iron features outstanding cost performance and suits conventional conveying scenarios without special requirements; spheroidal graphite cast iron, after carburizing treatment, boasts wear resistance and temperature resistance, and is suitable for media with strong abrasiveness; cast steel is pre-reserved with heat preservation structure, fitting the delivery of asphalt, resin and other media that tend to crystallize and solidify at room temperature; copper materials are applied to special working conditions with explosion-proof requirements; 304/316 stainless steel suits scenarios with corrosive media and high hygiene standards. Among them, 316 material delivers stronger corrosion resistance with slightly higher cost, and 304 is acceptable for scenarios without strong corrosion.

This type of equipment has clear advantages. During daily operation, the rotary pump features stable conveying without obvious pulsation, low vibration and low noise, and comes with reliable self-priming capacity. The co-rotation of inner and outer rotors brings slight wear and long overall service life, making it suitable for conveying high-viscosity thick media. Nevertheless, it has clear application limits: it is not suitable for working positions where the outlet pressure exceeds 1.2MPa, nor can it deliver sludge-like media with solid content ≥20%. Its overall procurement cost is higher than centrifugal pumps, screw pumps and diaphragm pumps of the same flow grade.

There are several red lines that must not be crossed in actual operation: before startup, cooling water must be supplied first, and preheating shall be completed with hot water or steam. Do not start the machine until the pump body temperature rises to the process requirement. Cut off the preheating heat source in a timely manner after shutdown, and operation without cooling water is prohibited. After conveying materials with high solidifying points, perform circulating cleaning for 5-10 minutes to prevent materials from remaining in the pump chamber and causing rotor seizure. During daily operation, regularly check whether pressure gauges, safety valves and overload protection devices are sensitive and reliable. Clean the inlet filter regularly within one year after installation to reduce clogging. Try to avoid Y-type filters with too small flow area, to prevent pump vibration induced by insufficient feed flow velocity. The internal material-contact parts of the equipment adopt smooth hygienic design for easy disassembly and cleaning. The two rotors do not contact each other, so no mutual wear occurs even after long-term operation, and the overall installation and maintenance threshold is relatively low.

Bonve pump always adheres to the philosophy of "Wholeheartedly Making Good Rotor Pumps," committed to providing global customers with customized conveying and mixing solutions. If you have technical inquiries, selection needs, case references, or other cooperation intentions related to Bonve rotor pumps, please feel free to contact us.  

Service Hotline: 0574-87588986 13586591794  

Official Website: www.bvpumps.com  

Business Email: market@bonvepumps.com  

We look forward to working with you to drive efficiency and innovation in industrial fluid transmission with precision technology.